High 8.1Published Apr 29, 2026

CVE-2026-7424Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

Updated under an hour ago (Oct 26, 2026, 2:00 PM ET)

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It affects AWS FreeRTOS-Plus-TCP and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS FreeRTOS-Plus-TCP

Exploited in the last 30 days

Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet. The issue is present whenever DHCPv6 is enabled. To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): CWE-191
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Analyzed
Record last updated: Apr 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS FreeRTOS-Plus-TCP aws:freertos_plus_tcp (from the name)	from 4.0.0 before 4.2.6; from 4.3.0 before 4.4.1; 4.2.6 not affected; 4.4.1 not affected	CNA record
amazon freertos-plus-tcp amazon:freertos-plus-tcp	from 4.0.0 before 4.2.6; from 4.3.0 before 4.4.1	NVD

References

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1	patch, release-notes
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6	patch, release-notes
https://aws.amazon.com/security/security-bulletins/2026-022-aws/	vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-wrhm-c99p-2p8g	third-party-advisory, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.